Once a simple food fish, koi have transformed into living jewels, with some fetching sky-high prices in the global luxury market. Here's how this happened. In the world of high-end pets, few creatures ...

Yuri, an orange and white koi fish, swims unassumingly among about 20 other female fish in her tank at Quality Koi Company in Carneys Point. To the untrained eye, she appears bigger than her ...